Amounts & costs dredged from 1954-1991 from the San Rafael Creekl and Across the Flats.
Amounts dredged have fallen -- causing diffulties for boating; and costs have risen -- causing cost problems for citizens.. 
Year  Amt Dredged Where
1954                       265,941 Flats & RC
1962                       244,449 Flats & RC
1969                       242,886 Flats & RC
1978                       152,945 Flats
1980                         51,599 RC
1986                       197,750 Flats
1987                         54,275 RC
1991                         49,070 RC
Flats   =  Across the Flats
RC    =  River Channel
Year Cost per cy
1954  $                         0.44
1962  $                         0.67
1969  $                         0.83
1978  $                         3.25
1980  $                         5.60
1986  $                         2.70
1987  $                         7.00
1991  $                         8.45
Increase
19 x's